SG-003A 4-20mA 0-24V Signal Generator Adjustable Voltage and Current Simulator Process Control Signal Calibrator

Excelente

Bought this as a short term stop-gap because my Fluke 787's current output decided to fail, so while that's getting repaired, I wanted this device to handle some cal/check stuff in the meantime. The good: Very accurate - I mean surprisingly so. Using a 6-1/2 digit benchtop DMM the overall accuracy was within 0.005mA out of the box. Very stable : with the mA output set at 80%, the output was right at +/- 16.0003mA, drifting between ~16.00045mA to ~16.00013mA - which is significantly better than most of the rest of the inexpensive calibrators here. Provided *cables* were pretty decent - not great, but decent, about as good as could be expected for the unit cost. Came well packed in a well designed box with nice foam packing. The "Huh?" - It arrived completely discharged: dead, dead deadski on the battery. Charged for ~4 hours & the indicator light went out *without* turning green. Unplugged/replugged the USB input, and charged for about another 15-20 minutes... and went out again. Repeated that & on the 3rd cycle it went green. So be patient if yours is completely discharged. The meh-bad: The USB charger is European pin style AC connection, so useless for me. The current output requires at least a fair few ohms to function - it will show "OC" if the current loop load is open or directly shorted (i.e. no load resistor) The actual bad: The user interface is about as bad as I've ever seen. Like... bad. Bad on toast. Dung-encrusted soup spoon bad. Completely non-intuitive. If you mess with it *enough*, you can get the basic functionality, and as I said earlier, it is *accurate*, and it drifts very little, but yeah... Ugh. Poor, poor design. The manual is also completely useless. In particular the fact that there are no connection diagrams at all AND there's no useful info on what does what, when... You absolutely *can* mess with it enough to eventually figure out most of it, but the combo of bad UI and bad manual doesn't do what is otherwise a solidly performing piece of kit any favors... The Modbus interface? Haven't messed with it yet, but they made some unusual choices for function codes to read/write the cal/operating parameters - they're really not well supported out in the world. Would have been *much* better to stick with function codes 3/6. All in all - because hardware wise, it truly is *very* accurate (especially for the cost), and has quite a low output drift especially for the cost, learning the goofy UI may very well be worth it - *if* you use it often enough to maintain familiarity with how it works.

Excellent product

Excelente relación calidad precio. Ideal para trabajos en campo, simple y funcional. La simulación de resistencia es algo que muchos simuladores no traen , buena opción para comprobación de lazos de temperatura

Works fine, fully featured, non-intuitive UI makes it almost impossible to use.

I didn't get this for perhaps it's typical intended use of generating signals for trouble shooting PLCs and such. I got this to use an educational tool to teach kids about electronics, voltage, current and signals and the like. While initial function and configuration was a little confusing at first, it was not hard at all to understand once I read the manual. I did have to break down and read the manual to understand it. The user interface actually changes the colors of the buttons to indicate different modes that you are in and you can control different things depending on these modes. I also found some helpful youtube videos where people demonstrated how to generate some signals with the device, which I was able to reproduce. It is also cool that you can visualize your generated output signal on the display and tweak it in real time. So, long term goal is to use this to generate some signals, and then show what the signals are, what voltages and frequencies are, which this seems well equipped to do. Then, on the other side, teach how to capture and view these signals on an Oscilloscope, without requiring a full on bench unit or a controller. My initial impression of this is it will work well for that purpose, seemed relatively affordable compared to other options, and seemed quite well made. I feel I have only touched the tip of the iceberg on what it can do. In my reading of the manual and some of the videos online, you can take an input signal of one type, current for example, and convert to a voltage signal, or vice versa, which I also think could be very useful for my intended usage. I think it could be a great troubleshooting tool for the kids as well when trying to diagnose where problems might be in a system, which can be difficult for them (or all of us really). Often the question arises, is it hardware, or is it software. I could see where this could potentially take away the software side of the question. Use this to generate the signal you think the software should be generating and verify you see the results you are expecting. If you do, you can hand it off to software, with proof your hardware works. If it doesn't use this to help figure out why.

Well this product did turn on upon delivery but it wasn't even on for 2 minutes because for some reason there was a spark inside when I flipped the device over just looking at it and it immediately powered off it would not turn back on. Took it apart and found loose components that shorted out the component board. Customer service is terrible and refuses to take responsibility for it even though I did not own the device for even 2 minutes. Didn't even get to test it out. Hell I didn't even get to plug the wires into it. Terrible support and therefore I cannot recommend it at all. Literally a waste of MY money that I PAID FOR. DON'T BELIEVE THIS FREE PRODUCT NONSENSE BECAUSE WE ALL STILL PAY FOR IT. It used to be free but not anymore so they need to update this crap and stop telling everyone that this program is free because it is not. Terrible product qc and atrocious customer support. Avoid. Avoid. Avoid.